1781283680 has 48 divisors (see below), whose sum is σ = 4590858384. Its totient is φ = 647738880.

The previous prime is 1781283661. The next prime is 1781283683. The reversal of 1781283680 is 863821871.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781283683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504287 + ... + 507806.

It is an arithmetic number, because the mean of its divisors is an integer number (95642883).

Almost surely, 2^1781283680 is an apocalyptic number.

1781283680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1781283680 is an abundant number, since it is smaller than the sum of its proper divisors (2809574704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1781283680 is a wasteful number, since it uses less digits than its factorization.

1781283680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012119 (or 1012111 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 1781283680 is about 42205.2565446533. The cubic root of 1781283680 is about 1212.2095365447.

The spelling of 1781283680 in words is "one billion, seven hundred eighty-one million, two hundred eighty-three thousand, six hundred eighty".